docs: def convert(self, destination_units, *, convert_variables=False, verbose=True):
          """Convert all compatable axes and constants to given units.
  
          Parameters
          ----------
          destination_units : str
              Destination units.
          convert_variables : boolean (optional)
              Toggle conversion of stored arrays. Default is False
          verbose : bool (optional)
              Toggle talkback. Default is True.
  
          See Also
          --------
          Axis.convert
              Convert a single axis object to compatable units. Call on an
              axis object in data.axes.
          """
          # get kind of units
          units_kind = wt_units.kind(destination_units)
          # apply to all compatible axes
          for axis in self.axes:
              if axis.units_kind == units_kind:
                  orig = axis.units
                  axis.convert(destination_units, convert_variables=convert_variables)
                  if verbose:
                      print(
                          "axis {} converted from {} to {}".format(
                              axis.expression, orig, destination_units
                          )
                      )
          # apply to all compatible constants
          for constant in self.constants:
              if constant.units_kind == units_kind:
                  orig = constant.units
                  constant.convert(destination_units, convert_variables=convert_variables)
                  if verbose:
                      print(
                          "constant {} converted from {} to {}".format(
                              constant.expression, orig, destination_units
                          )
                      )
          if convert_variables:
              for var in self.variables:
                  if wt_units.kind(var.units) == units_kind:
                      orig = var.units
                      var.convert(destination_units)
                      if verbose:
                          print(
                              "variable {} converted from {} to {}".format(
                                  var.natural_name, orig, destination_units
                              )
                          )
          self._on_axes_updated()
          self._on_constants_updated()